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This is really useful for what the video is showing, which is how to see how games and other stuff on mobile devices work.

It's too bad though that this is highly impractical in terms of "hacking" considering SSL/TLS encrypted traffic (which most juicy data happens to be nowadays) without a way to read it in plaintext is about as useful as lips on a chicken. You still have a few options though, you could use SSLstrip to force the user to use http links which is infeasible because it only works on very outdated browsers, MITMf + sslstrip2 to bypass the HSTS HTTP header which is improbable to work because it only works on pretty outdated browsers or if the user has never visited the website once in that browser, SSLstrip which is a transparent proxy that forges the target website's SSL certificate (minus the fingerprint) which works on anything however newer browsers will display a certificate warning (which will probably work on uneducated or gullible people), or you could install a self-signed certificate on the target device like he does in the video but this obviously won't be happening in a scenario where you're just trying to sniff the traffic of some random person a network.

It can still be very helpful in terms of "hacking".

Imagine an application that blocks the WinPcap driver, wireshark and it won't work in a VM. You want to find out what it does so you can emulate their server in order to sign in. But just running a sniffing tool won't work since almost any windows tools use the WinPcap driver so just listening to it from another device would be a way to get around the applications limitations.

You can also use a similar method to read the traffic of video games. For example the well known game PUBG doesn't encrypt its traffic so you can just read player information without getting banned because the anticheat is running on a different machine than the actual "cheat".

But I gotta admit that your scenario where you're just trying to sniff the traffic of some random person a network won't work that way.

When I said "hacking" I was referring to things like capturing credentials from traffic in a network or other important proprietary data.